linux-kernel - [PATCH] mm/zsmalloc: avoid unnecessary iteration in get_pages_per

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Date:	Thu,  5 May 2016 13:17:27 +0800
From:	Ganesh Mahendran <opensource.ganesh@...il.com>
To:	minchan@...nel.org, ngupta@...are.org,
	sergey.senozhatsky.work@...il.com, akpm@...ux-foundation.org
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Ganesh Mahendran <opensource.ganesh@...il.com>
Subject: [PATCH] mm/zsmalloc: avoid unnecessary iteration in get_pages_per_zspage()

if we find a zspage with usage == 100%, there is no need to
try other zspages.

Signed-off-by: Ganesh Mahendran <opensource.ganesh@...il.com>
Cc: Minchan Kim <minchan@...nel.org>
Cc: Nitin Gupta <ngupta@...are.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
---
 mm/zsmalloc.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index fda7177..310c7b0 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -765,6 +765,9 @@ static int get_pages_per_zspage(int class_size)
 		if (usedpc > max_usedpc) {
 			max_usedpc = usedpc;
 			max_usedpc_order = i;
+
+			if (max_usedpc == 100)
+				break;
 		}
 	}
 
-- 
1.7.9.5